ffff ffss fftf ffun fnuf fssf fuff fufu funf funs funt fuss fust fusu futs futu nfff nfsu nnnn nnss nntn nsfs nssf nsss nsts nstu ntfs ntnu ntsf ntss ntsu nuff nunn nuns nunt nuss nust nusu nuts nutt nutu sfnt sfss sfsu sfts snfu snns snus ssns sssf ssss ssts stfn stfu stnn stns stsf stss stuf stun stus stut suf- suff sufs sufu sun- sunn suns sunt sunu sus- suss sust susu sutu suus tfss tnts tnut tssf tsst tsts tsun ttff ttfn ttss tttt tuff tuft tufu tunn tuns tunu tuss tust tuts tutt tutu unns uns- unst unts unus unut usfs usnu ussf usss usst ussu usts usun usus uttu uutf uuuu